Egyptian anti-government protesters who spent the night in Tahrir square in Cairo, Egypt, are seen backdropped by smoke billowing from a burning building Saturday, Jan. 29, 2011. (AP Photo/Lefteris Pitarakis)— AP

The Egyptian museum is seen intact, right, as smoke billows from the ruling National Democratic party building, torched by anti government protesters overnight, in central Cairo, Egypt, Saturday, Jan. 29, 2011. (AP Photo/Ben Curtis)
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An Egyptian anti-government activist, wounded during clashes with police, poses for the photographer along with other protesters in Tahrir square in Cairo, Egypt, early Saturday, Jan. 29, 2011. Mobile phone service have been partially restored in Egypt, Saturday, after the recent communications blackout. (AP Photo/Lefteris Pitarakis)— AP

An Egyptian anti-government activist, wounded during clashes with police, poses for the photographer along with other protesters in Tahrir square in Cairo, Egypt, early Saturday, Jan. 29, 2011. Mobile phone service have been partially restored in Egypt, Saturday, after the recent communications blackout. (AP Photo/Lefteris Pitarakis)
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Egyptians gesture as they stand atop an Egyptian army armored vehicle as they celebrate in downtown Cairo, Egypt, Saturday, Jan. 29, 2011. Hundreds of anti-government protesters returned Saturday to the streets of central Cairo, chanting slogans against Hosni Mubarak and attacking police just hours after the Egyptian president fired his Cabinet and promised reforms but refused to step down. (AP Photo/Amr Nabil)— AP

Egyptians gesture as they stand atop an Egyptian army armored vehicle as they celebrate in downtown Cairo, Egypt, Saturday, Jan. 29, 2011. Hundreds of anti-government protesters returned Saturday to the streets of central Cairo, chanting slogans against Hosni Mubarak and attacking police just hours after the Egyptian president fired his Cabinet and promised reforms but refused to step down. (AP Photo/Amr Nabil)
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Egyptian protesters greet army soldiers atop military vehicles as they pass along the street in central Cairo, Egypt, Saturday, Jan. 29, 2011. Hundreds of anti-government protesters have returned to Cairo's central Tahrir Square, chanting slogans against Hosni Mubarak just hours after the Egyptian president fired his Cabinet but refused to step down. (AP Photo/Ahmed Ali)— AP

Egyptian protesters greet army soldiers atop military vehicles as they pass along the street in central Cairo, Egypt, Saturday, Jan. 29, 2011. Hundreds of anti-government protesters have returned to Cairo's central Tahrir Square, chanting slogans against Hosni Mubarak just hours after the Egyptian president fired his Cabinet but refused to step down. (AP Photo/Ahmed Ali)
/ AP

CAIRO 
Police have opened fire on a massive crowd of protesters in downtown Cairo, killing at least one demonstrator.

Thousands of protesters are trying to storm the Interior Ministry located in the heart of the city.

At least one body was seen being carried out on the shoulders of protesters Saturday. Many people were wounded as well.

It was not immediately clear whether the riot police were shooting live ammunition or rubber bullets.

Massive anti-government demonstrations are sweeping through downtown Cairo, defying a government curfew and demanding the ouster of President Hosni Mubarak.